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|Title: ||Excess nitrate in the East China Sea|
|Authors: ||G.T.F. Wong;G-C. Gong;K-K. Liu;S-C. Pai|
|Keywords: ||East China Sea;nutrients;Changjiang;Kurishio|
|Issue Date: ||2017-02-24T08:29:40Z
|Publisher: ||Estuarine, Coastal and Shelf Science|
‘ Excess nitrate ’ was found in waters with salinities below 30·5 in the top 10–15 m of waters covering one-third to one-half of the East China Sea in the summer of 1992. In these waters, significant concentrations of [nitrate+nitrite], up to about 6 μM, could be found while the corresponding concentrations of phosphate remained at or below 0·07 μM. Thus, the ratio of [nitrate+nitrite] to phosphate in these waters was far in excess of that at which these two essential nutrients are utilized by marine phytoplankton. (‘ Excess nitrate ’ is the concentration of [nitrate+nitrite] in excess of that which may be utilized by marine phytoplankton at the observed concentration of phosphate.) As a result, in contrast to the open marine systems in general, primary production in a significant portion of the East China Sea may be phosphate-limiting rather than nitrogen-limiting. The area covered by this layer of combined nitrogen-rich water could be temporally variable. While no ‘ excess nitrate ’ was detected in the south-eastern East China Sea along the Chinese coasts in the summer of 1992, significant quantities of ‘ excess nitrate ’, up to 4 μM, were found at the same location in the early spring of 1993 in waters with salinities as high as 34·5.
|Relation: ||46(3), pp.411-418|
|Appears in Collections:||[海洋環境與生態研究所] 期刊論文|
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